<template>
  <el-container>
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" round @click="logout">退出</el-button>
    </el-header>

    <!-- 页面主体 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside width="200px">
        <!-- 侧边栏菜单 -->
        <el-menu background-color="#313743" text-color="#fff" active-text-color="#379aff" unique-opened router :default-active="activePath">
          <!-- 一级菜单 -->
          <el-submenu v-for="item in menuList" :key="item.id" :index="item.id + ''">
            <!-- 一级菜单模板区 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]" style="color:#fff;"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>

            <!-- 二级菜单 -->
            <el-menu-item v-for="subItem in item.children" :key="subItem.id" :index="'/' + subItem.path" @click="saveNavState('/' + subItem.path)">
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu" style="color:#fff;"></i>
                <!-- 文本 -->
                <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data () {
    return {
      menuList: [],
      iconsObj: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      window.sessionStorage.clear()

      this.$message.success('登出成功')

      this.$router.push('/login')
    },
    // 获取菜单
    async getMenuList () {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      } else {
        this.menuList = res.data
      }
    },
    // 保存导航激活状态
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath)

      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.el-header {
  background-color: #373D41;
  display: flex;
  justify-content: space-between;
  padding-left: 10px;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}

.el-aside {
  background-color: #313743;

  .el-menu {
    border-right: none;
  }
}

.el-main {
  background-color: #EAEDF1;
}

.el-container {
  height: 100%;
}

.iconfont {
  margin-right: 10px;
}
</style>
